Weft detector in transferrer arm



March 27, 1928. 1,663,929

H. H. wA'rsoN WEFT DETECTOR IN TRANSFERRER ARH Filed Dec. 27. 1926 Patented Mar. 27, 1928.

UNITED STATES;

PATENT oFFlcE.

HERBERT H. WATSON, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO CROMPTON & KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A CORI?ORAJIION OF c MASSACHUSETTS.

WEET DETECTOR IN TRANSFER/RER ARM.

Application led December 27, 1926. Serial` No. 157,092.

This invention relates to improvements in weft detectors for regularly moving loom transferrer arms and it is the principal object of the invention to provide a mounting which will hold the detector in proper yarn engaging position but will permit the same to move forwardly with the yarn as the la)7 advances.

In weft detectors of the kind set forth in patent to Ryon #1,372,316, the transferrer arm is brought down on every detecting beat of the loom to present the detector to the yarn through the top of the shuttle The lay undergoes an appreciable movement during the time that the detectoris in contact with the yarn which results in an undesirable amount of wear when the yarn is tine. It is an important object of my invention to mount the detector on a resilient device which will permit the yarn engaging portion to move forwardly or rearwardly with the bobbin to avoid thisobjectionable wear.

It is a further object of my invention to provide a supporting arm movably-mounted on the transferrer and having a detector support secured thereto by means of a connection which is not subject to wear and does not require oiling, thus preventing the possibility of staining the weft. A: still further 3o object of the invention is to provide a detector which can be'easily replaced and not VVaffected by accumulations of lint.

Itis a more particular object of the invention vto provide a coil spring located be- 85 tween the yarn engaging portion of the Idetector and the' carrier lever therefor and having engagement with non-circular parts of the supporting lever and detector to hold the latter in proper alignment, said spring also acting to cushion any rebound of the detector.

With these and other objects which will appear as the description proceeds, my invention relates to the arrangements and comybinations of partsy hereinafter setforth, and

' more particularly pointed out inthe claims.

In the accompanying drawings, wherein a convenient embodiment of my invention is shown, c

Fig. 1 is a vertical central section through that portion of the transferrer arm lying parallel to and above the shuttle when the latteris on .the magazine side ofthe loom and showing the detector in engagement with a sufficient supply of weft,

Fig. 2 is a View similar to Fig. 1 but with the detector moved toy indicating position,

the supply of weft being insufficient,

Fig. 3 is a vertical section on line 3-3 of Fig. Fig. 4 is a detail top plan View taken in the direction of arrow lv of Fig. 1,

Fig. 5 is an enlarged horizontal section on line 5--5 of Fig. 2, and i Y Fig. 6 is an enlarged vertical section on line 6-6 of Fig. 5.

Referring to the drawings the transferrer arm 10 is provided with vertical walls 11 between which extend a yarnfengaging tip 12 landa bobbin but-t engaging heel 13. An indicating plunger 14 is `slidably mounted 1n a bore 15 extending horizontally through a portion of the transferrer arm and is normally urged to move to the right from" theV position shown in Fig. 1 by a compression spring 16. Said spring is interposed between a web 17 of the transferrer arm and a shoulder 18 of the plunger head and a pin 19 extending through the plunger is positioned to engage said web 17 as shown in Fig. 2 to limit voutward movement of the plunger. Y

A latch 2O is pivoted as at 21 tothe transferrer arm and lies between the walls 11,- said latch having a hook 22 to be received lby a notch 23 formed in the plunger and having also ay depending tail 24. The latch is counterweighted so that it tends normally 'to move into the position shown in Fig. 1

where it will restrain movement of the plunger'lll and-holdv the same in non-indicating position.`

Av carrlerlever y25 is pivoted as at26 vto the transferrer arm and has a linger 27 positioned for lengagement with some portion of the transferrer arm when the carrier is raised.' Said lever isr held in raised position by a tension lspring'28 onelend of whichis passed arounda lug 29 onfthe'carrier lever 25 andthe'other end of which is secured to the transferrer arm as at 30.`

During normal 'operation the transferrer arm is brought downwardly on eachdetecting beat of the loom by mechanism not gaging unit having a notched weft engaging lower surface 41 and an upwardly extending trip 42 on the right hand side thereof. Said trip is" adapted for engagement with the tail 24 at the time of indicationoi weft exhaustion. The left hand portion of; the: unit 40 extends upwardly'and is non-circular in cross section as indicated in` Eig. 5, having the lower closed coils 43 of the supporting spring wound closely there` around.

The spring 44 may be as shown in Fig. 1 and has the central portion provided with open coils while the upper end of the spring is similar to the lower end, being wound in closed coils 45 which, hug the non-.circular depending portion of the supporting lever 25` as;y shown in Fig. 5. By means of the noncircular portion of the lever and detector unit thelatter is held in proper alignment with regard to the axis oi the bobbin beingdeteoted. The closed coils lie in c orrugations 46 formed in the spring engaging portions of the detector unit and Supportling. lever, both of said portions being similar inpcross section to the showing in Fig. 5.

When sufficient weftV is present the detector unit will be held against movement longitudinally along the bobbin, but at eX hanstion of weft said unit will slide along the Abare bohbin into Contact with tail 24 toy trip, the latch and release.l the plunger 14, as shown in Fig. 2. During this movement lthe lay advances a slight amount and may carry the detecting unit with it due to the yielding ot spring 44, but the tail 24 is wide enough to be engaged by the trip 42 kin any lateral position of the detector unit `relatively to the transierrer arm, see Fig. 4.

From the foregoing it will be seen that I have provided a weft detector on the transerrer army wherein the detecting unit has interposed between the same and the transferrer arm a resilient element which normally holds the detector in proper position but which. permits the samel to moveto engage the 'tail 24 and lift the latch lto release Vther plungerwhen the unit 40 engages a bare ibobbin. The resilient element also permits 'the .detector to vmove v,with the bobbin and lthnsavoid, trictionalcontact and consequent wearing usual in this type of eeler. Furthlmore., it vwill be seen that the connection between the detector and its carrier is of such, va nature as not tol require lubrication, and lthat the detector can be readily removed and/replaced. n

Having thus described my invention it the connections-to` be movable as will be apparent that changes and modifications may be made therein by those,` skilled in the art without departing from the spirit and seopeof the invention, and I do not 'wish to be limited to the details herein disclosed but what I claim is: j

l. In weit detecting mechanism for afloom having a transferrer arm receiving a lregular movement toward the surface to be detected each detecting beat oil the loom, a wett engaging detecting unit, raV coil spring having one end connected to the unit, and connections between the other endv oi the coil spring and the transierrer arm, said coil springconstitutingthe only support for said detectingv unit and said spring and' ddetecting. unit being freely suspended yfrom. a vWl1's ,1,. any direction.

2. In a weft detecting mechanism Vfor loom hav-ing a transierrerarin receiazing a regular movement toward the s ur fac'e to detected each detecting beat of thelloem, a

carrier lever pivoted to, the transferreif; arm, a yarn engaging .detecting unit, andg ;a eeil interposed between the unit and, the; lever and constitutingY the onlyy snpportforsaid detecting unit.l i'

3. In a werft, detecting for al 100m having transferrer arm reefllilg@ regular movement towardthe Surf-.ece i9: he detected'. @aah detecting heatv Qf the lQQm Carrier movbly 1rr1 imte thetraeierrer, a dtecting dritto .engagea the yal-21,17. @nel resilient support capable of` nnovenienty in all directions interposedA between the 'heit and the. movable carrier.l Y l 4.. In a weft. detecting mechanism fer( .a 1.00m having a` transferlr afm feevne a ree-111er lilovement toward. the; .Surface-t0: Vle@ detected each, detetng beat 0i. the. 130.9111, e carrier movable with were@ te the tiene ferrer arm, a detecting unit. te engage the yarn t@ be. detected; and a Herible Supperting element between the unit andV the car'- ref yeldable infill dreCtQnS, whereby Said unit may more, in any drcten in which Ythe surface being .deteted moves.

5., In. .aY weft detetine meehanism, fQr a loom having a transferrer anni reeeivingla regular movement toward thel surface'. tto, be

detected each detecting beat ofV the,floon,1,` a Y carrier movable on the transferrer and having a non-circular portion, a detector unit having a noncireular portion, vancl-aleoil .spring interposedY between the unit landthe Carrier and having holding-'engagement with the non-.circular portions oi said carrier and unit to hold the latter in surface lto be detected.

a weft engaging detecting unit having l a non-circular portion, a coil spring formed non-circular portions, whereby thel detecting unit is held in alignment with the surface to be detected and is capable of movement with` said surface.

7. In weft detecting Ymechanism fora loom having a transferrer arm'receiving a regular movement toward the surface to be detected each detecting beat of the loom, a weft detecting' unit, a carrier therefor movable with respect to the transfer-rer,- and a resilient support. interposed between the carrier and the unit havingthe ends thereof fixed with respect to the carrier and the unit, said detector being movable relatively tothe carrier due to the resilience of theY support. Y

8. In weft detecting mechanism for looms,

a member movable downwardly toward the V surface to be detected at periodic intervals, a detecting unit to engage the surface to be detected, and kieXible connectionsbetweenl the detecting unit and member and constituting the onlyA means of support for said unit, said connections being capable ofV movement in all directions, whereby the detecting unit may move with the surface to be detected and in contact therewith as sai-d ksurface moves underthe member and said `detecting unit and vconnections being freely suspended from the member to be movable as a whole in all directions.

9. In weft detecting mechanism for a loom having a transferrer arm receiving a regular movement toward the .surface to be detected each detecting .beat of the loom, a carrier movable on the transferrer arm, a detector unit,v and -a coil spring interposed between the carrier and unit. and having closed coils to engage the carrier and unit and having open coils between said carrier and unit and constituting the yonly means of support for said unit. A. In testimony whereof I xed my signature. y y

Y HERBERT H. WATSON.

have hereunto af- 

